"The Unknown People"
I've seen this (and the movie) several times. But it was not until a day ago that I noticed something comic in what is otherwise a deadly serious story. As the mob gathers to find the alien critters and kill them, one of the townspeople pulls a barber pole off a building's wall to use as a weapon!
The story itself is an obvious frontal assault on McCarthyism, and it pulls no punches.
Do I need to point out that, in the nearly 70 years since this film was made, nothing has changed? Note how the hospital's head (who ought to be a rational scientist) shows utter contempt for the aliens. The "good" doctor (who removes the bullet) says the creatures would be an interesting part of his study on brain size. This reflects the long-discredited belief that brain size and "intelligence" are related. * (The mole men apparently have very large brains.)
Also note that the mob leader is played by Jeff Corey, a "notorious" Hollywood liberal. He would play a similar role in Star Trek's "The Cloud Minders".
* Bats and parrots are highly intelligent, but have "small" brains.